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Assert whether simple feature coordinates are longlat degrees
st_is_longlat(x)
TRUE if x has geographic coordinates, FALSE if it has projected coordinates, or NA if is.na(st_crs(x)).
TRUE
x
FALSE
NA
is.na(st_crs(x))
object of class sf or sfc, or otherwise an object of a class that has an st_crs method returning a crs object
crs